America’s strength has not been its diversity, but her ability to overcome the inherent problems in diversity, writes Thomas Sowell.

America’s great good fortune in the past has been that Americans have been able to unite as Americans against every enemy, despite our own internal differences and struggles. Black and white, Jew and Gentile, have fought and died for this country in every war.

Today, that sense of American unity is being undermined by the reckless polarization of group identity politics. That affects not only how Americans see themselves, but how others in our midst see America.

Some people demand American citizenship, as if it is an entitlement, while burning the American flag and waving the flag of Mexico. And the apostles of “diversity” and “multiculturalism” watch in silence. That includes the President of the United States.

Most debates about immigration policies are contests in rhetoric, with hard facts being ignored as if they didn’t exist.

Tragically, the massacre in Orlando seems unlikely to change that. Too many people have too much invested in their own particular position to change, especially in an election year.